frostfs-node/pkg/local_object_storage/metabase/graveyard.go

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package meta
import (
"bytes"
"errors"
"fmt"
oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
"go.etcd.io/bbolt"
)
// GarbageObject represents descriptor of the
// object that has been marked with GC.
type GarbageObject struct {
addr oid.Address
}
// Address returns garbage object address.
func (g GarbageObject) Address() oid.Address {
return g.addr
}
// GarbageHandler is a GarbageObject handling function.
type GarbageHandler func(GarbageObject) error
// GarbageIterationPrm groups parameters of the garbage
// iteration process.
type GarbageIterationPrm struct {
h GarbageHandler
offset *oid.Address
}
// SetHandler sets a handler that will be called on every
// GarbageObject.
func (g *GarbageIterationPrm) SetHandler(h GarbageHandler) {
g.h = h
}
// SetOffset sets an offset of the iteration operation.
// The handler will be applied to the next after the
// specified offset if any are left.
//
// Note: if offset is not found in db, iteration starts
// from the element that WOULD BE the following after the
// offset if offset was presented. That means that it is
// safe to delete offset element and pass if to the
// iteration once again: iteration would start from the
// next element.
//
// Nil offset means start an integration from the beginning.
func (g *GarbageIterationPrm) SetOffset(offset oid.Address) {
g.offset = &offset
}
// IterateOverGarbage iterates over all objects
// marked with GC mark.
//
// If h returns ErrInterruptIterator, nil returns immediately.
// Returns other errors of h directly.
func (db *DB) IterateOverGarbage(p GarbageIterationPrm) error {
db.modeMtx.RLock()
defer db.modeMtx.RUnlock()
if db.mode.NoMetabase() {
return ErrDegradedMode
}
return db.boltDB.View(func(tx *bbolt.Tx) error {
return db.iterateDeletedObj(tx, gcHandler{p.h}, p.offset)
})
}
// TombstonedObject represents descriptor of the
// object that has been covered with tombstone.
type TombstonedObject struct {
addr oid.Address
tomb oid.Address
}
// Address returns tombstoned object address.
func (g TombstonedObject) Address() oid.Address {
return g.addr
}
// Tombstone returns address of a tombstone that
// covers object.
func (g TombstonedObject) Tombstone() oid.Address {
return g.tomb
}
// TombstonedHandler is a TombstonedObject handling function.
type TombstonedHandler func(object TombstonedObject) error
// GraveyardIterationPrm groups parameters of the graveyard
// iteration process.
type GraveyardIterationPrm struct {
h TombstonedHandler
offset *oid.Address
}
// SetHandler sets a handler that will be called on every
// TombstonedObject.
func (g *GraveyardIterationPrm) SetHandler(h TombstonedHandler) {
g.h = h
}
// SetOffset sets an offset of the iteration operation.
// The handler will be applied to the next after the
// specified offset if any are left.
//
// Note: if offset is not found in db, iteration starts
// from the element that WOULD BE the following after the
// offset if offset was presented. That means that it is
// safe to delete offset element and pass if to the
// iteration once again: iteration would start from the
// next element.
//
// Nil offset means start an integration from the beginning.
func (g *GraveyardIterationPrm) SetOffset(offset oid.Address) {
g.offset = &offset
}
// IterateOverGraveyard iterates over all graves in DB.
//
// If h returns ErrInterruptIterator, nil returns immediately.
// Returns other errors of h directly.
func (db *DB) IterateOverGraveyard(p GraveyardIterationPrm) error {
db.modeMtx.RLock()
defer db.modeMtx.RUnlock()
if db.mode.NoMetabase() {
return ErrDegradedMode
}
return db.boltDB.View(func(tx *bbolt.Tx) error {
return db.iterateDeletedObj(tx, graveyardHandler{p.h}, p.offset)
})
}
type kvHandler interface {
handleKV(k, v []byte) error
}
type gcHandler struct {
h GarbageHandler
}
func (g gcHandler) handleKV(k, _ []byte) error {
o, err := garbageFromKV(k)
if err != nil {
return fmt.Errorf("could not parse garbage object: %w", err)
}
return g.h(o)
}
type graveyardHandler struct {
h TombstonedHandler
}
func (g graveyardHandler) handleKV(k, v []byte) error {
o, err := graveFromKV(k, v)
if err != nil {
return fmt.Errorf("could not parse grave: %w", err)
}
return g.h(o)
}
func (db *DB) iterateDeletedObj(tx *bbolt.Tx, h kvHandler, offset *oid.Address) error {
var bkt *bbolt.Bucket
switch t := h.(type) {
case graveyardHandler:
bkt = tx.Bucket(graveyardBucketName)
case gcHandler:
bkt = tx.Bucket(garbageBucketName)
default:
panic(fmt.Sprintf("metabase: unknown iteration object hadler: %T", t))
}
c := bkt.Cursor()
var k, v []byte
if offset == nil {
k, v = c.First()
} else {
rawAddr := addressKey(*offset, make([]byte, addressKeySize))
k, v = c.Seek(rawAddr)
if bytes.Equal(k, rawAddr) {
// offset was found, move
// cursor to the next element
k, v = c.Next()
}
}
for ; k != nil; k, v = c.Next() {
err := h.handleKV(k, v)
if err != nil {
if errors.Is(err, ErrInterruptIterator) {
return nil
}
return err
}
}
return nil
}
func garbageFromKV(k []byte) (res GarbageObject, err error) {
err = decodeAddressFromKey(&res.addr, k)
if err != nil {
err = fmt.Errorf("could not parse address: %w", err)
}
return
}
func graveFromKV(k, v []byte) (res TombstonedObject, err error) {
if err = decodeAddressFromKey(&res.addr, k); err != nil {
err = fmt.Errorf("decode tombstone target from key: %w", err)
} else if err = decodeAddressFromKey(&res.tomb, v); err != nil {
err = fmt.Errorf("decode tombstone address from value: %w", err)
}
return
}
// DropGraves deletes tombstoned objects from the
// graveyard bucket.
//
// Returns any error appeared during deletion process.
func (db *DB) DropGraves(tss []TombstonedObject) error {
db.modeMtx.RLock()
defer db.modeMtx.RUnlock()
if db.mode.NoMetabase() {
return ErrDegradedMode
} else if db.mode.ReadOnly() {
return ErrReadOnlyMode
}
buf := make([]byte, addressKeySize)
return db.boltDB.Update(func(tx *bbolt.Tx) error {
bkt := tx.Bucket(graveyardBucketName)
if bkt == nil {
return nil
}
for _, ts := range tss {
err := bkt.Delete(addressKey(ts.Address(), buf))
if err != nil {
return err
}
}
return nil
})
}